Improved blind-hinge



datiert mes CHARLES B. CLARK, OF BUFFALO, NEW YORK.A

Letters .Patent No. 99,8114, dated February 15, 1870 mtezlated January 5, 1870.

*-QOO-bh IMPROVED BLIND-HINGE.

The Schedule referred to in these Letters Patent: and making part of the' same.

I, CHARLES B. CLARK, of the city of Buffalo, in the county of Erie, and State ot' New York, have invented a certain new'and useful Improvement in Blind- Hinge's, of which the following is a specilicatou.

'l'he present invention is an improvement on that for which Letters Patent of the United States were granted to me November 3, 1868, to which Letters Patent reference is here made for a general description ofthe original device and its mode ot' operation.

The original invention consisted in the combination ot' inclined shoulders or partial stopswith the pintle and socket, the latter formed with an angular recess inone side, and the former Withan angular side to lit therein whenthe blind was thrown open, wherebythe ictional resistance opposed bythe hinge was increased. The blind was retained in an open position by the resistance of the hinge, which formed a. partial and not a.` rigid block.

While this hinge has proved asuccess, I have found, tirom experiment, that by making the recess inthe socket and the corresponding side ot' the pintle of a peculiar torna,` the friction ofthe hinge was materially increased, which form also enabled me to dispense with the sharp angle that is 4liable to wear oli, and thus iinpair the eficiency of theitastening.

My invention consists in making the sides of the recess in the socket and the sides of the angular portion-ot' the pintle ot' an ogee form, or of nearly that form, as hereinafter shown and described.

In the accompanying drawings- Figure 1 is aview in elevation of my improved hinge applied to a blind shown in a locked open position.

Figure II is a view ofthe hinge in an unlocked position.

A is the female portion of the hinge, attached toY the Wall or casing B; and

C, the male portion, attached to the shutter D.

h is the pint-le; and

g, its socket.

h h', the ogee sides of the angular portion of the pintle; and

g g', th'ecorresponding sides of the recess in the socket.

fm m', the inclined shoulders orl stops formed in they contiguous surfaces of the knuckles ot' the hinge, which stop against each other in holding:r the shutter open.

lt is evident that when the pintle, thus constructed,

is pres/sed in the recess in its socket, as represented in Fig.'IIl, the binge will oppose a much greater resistance to the turning of the shutter, owing to the partial locking ot' the pintlein the recess, than it would it' the pintle and its socket were constructed as shown in the original patent, hereinbetore referred to;

` What l claim as my invention 4is- Constructingr the pintle h and socket g with the ogee sides h' hf and gy', in the manner and for the purpose shown and described.

.CEAS B. CLARK.

Witnesses:

J AY HYATT, J No. J. BONNER. 

